Open AccessTemperature effects in tuning fork enhanced interferometric photoacoustic spectroscopy
Author(s) -
Michael Köhring,
S. Böttger,
Ulrike Willer,
Wolfgang Schade
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.020911
Subject(s) - tuning fork , photoacoustic spectroscopy , resonator , materials science , optics , interferometry , spectroscopy , multiphysics , silicon , optoelectronics , laser , finite element method , physics , vibration , acoustics , quantum mechanics , thermodynamics
Temperature dependent measurements with a compact fiber coupled sensor for trace gas detection in the near-infrared based on tuning fork enhanced interferometric photoacoustic spectroscopy are presented. The temperature effects on the sensor have been investigated in a range from T = -41 °C to T = 107 °C, in particular the influence on the resonance frequency and the Q-factor of the micro tuning fork. The refined sensor head contains a combination of a silicon tuning fork and an acoustic off-beam resonator and permits methane detection with a detection limit of S = (3.85 ± 0.01) ppm. The functional capability of a numerical model for the optimization of acoustic off-beam resonators in COMSOL Multiphysics® is presented.